[dev-context] A robust way of detecting ConTeXt from LaTeX3

Vítek Novotný witiko at mail.muni.cz
Mon Jul 18 11:49:00 CEST 2022


Dear Henri,

thank you for your suggestion. Hans already reached out to me and his
suggestion matches yours. I think \contextversion is what we have been
looking for.

Best,
Vit

On Sun, Jul 17, 2022 at 07:59:02PM +0200, Henri Menke wrote:
> On Fri, 2022-07-15 at 18:37 +0200, Vít Novotný wrote:
> > Dear ConTeXt developers,
> > 
> > in the l3file module of LaTeX3, we need to detect whether we are
> > using the ConTeXt format, so that we can correctly decide which input
> > and output streams are reserved by the format, and whether we need to
> > \relax a control sequence before using \newread and \newwrite with
> > it.
> > 
> > At the moment, we detect ConTeXt by checking that the \normalend
> > command is defined. However, this can produce false positives outside
> > iniTeX when LaTeX3 is loaded from the expl3-generic.tex macro package
> > and a \normalend user command is defined. Furthermore, this can
> > produce false negatives if a future version of ConTeXt does not
> > define \normalend.
> > 
> > Can you suggest alternative internal command(s) that we can use to
> > detect ConTeXt? Here are the desiderata:
> > 
> > - No false negatives: All past versions of ConTeXt define these
> > commands. All future versions of ConTeXt are likely to define these
> > commands.
> > 
> > - No false positives: The commands are long / contain characters that
> > don't have letter catcode in the normal regime and therefore are
> > unlikely to be defined by users. The text of the commands contains
> > ConTeXt-specific terminology that makes them unlikely to be defined
> > by other formats.
> 
> How about \contextversion?
> 
> Cheers, Henri
> 
> > 
> > Looking forward to your helpful suggestions.
> > 
> > Best,
> > Vit
> > _______________________________________________
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> > dev-context at ntg.nl
> > https://mailman.ntg.nl/mailman/listinfo/dev-context
> 
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